You can add confirm to the email after the page is completed. Are you looking to add two email address fields and confirm that way? or are you trying to do unique value confirmation in the database? You could also do email confirmation by sending an email with a link back to truly confirm.
I'm not that familiar with the bootstrap validation, so I'd need to see an example and research it to be sure. Client validation that mimics bootstrap would probably require using the bootstrap code. Most likely the webassist server validation could tap into the styles and techniques bootstrap uses directly, you would just have to look at what bootstrap does and mimic it in the written elements.